Influence of land use on spatial distribution of primary productivity in aquatic environment in the Weihe River Basin, China  

作　　者：ZHANG Haoying LI Nan SONG Jinxi WANG Fei TANG Bin GUAN Mengdan ZHANG Chaosong ZHANG Yuchen 

机构地区：[1]Xi'an Key Laboratory of Environmental Simulation and Ecological Health in the Yellow River Basin,College of Urban and Environmental Sciences,Northwest University,Xi'an 710127,China [2]Shaanxi Key Laboratory of Environmental Monitoring and Forewarning of Trace Pollutants,Shaanxi Environmental Monitoring Center,Xi'an 710054,China [3]Yellow River Institute of Shaanxi Province,Northwest University,Xi'an 710127,China

出　　处：《Journal of Arid Land》2025年第3期304-323,共20页干旱区科学(英文版)

基　　金：jointly supported by the National Natural Science Foundation of China (42230513);Key Program of the Shaanxi Key Laboratory of Environmental Monitoring and Forewarning of Trace Pollutants (SHJKFJJ 202307);Research Project on Ecological Protection and High-Quality Development in the Yellow River Basin,China (2022-YRUC-01-0101)。

摘　　要：Increasing concerns regarding aquatic ecological health and eutrophication driven by urbanization and human activities have highlighted the need to understand primary productivity(PP)dynamics in aquatic ecosystems. This study investigated the spatial distribution of PP across the Weihe River Basin, China using inverse distance weighting and analyzed the influence of different land uses and water physical-chemical parameters on PP using Mantel test and Spearman analysis. Significantly spatial heterogeneity in PP concentrations, ranging from 0.458 to 3262.807 mg C/(m^(2)·d), was observed with high-PP sites clustered in the middle-lower reaches dominated by farmland-construction land mosaics.Core drivers included light availability(Secchi depth and sunlight duration) and phytoplankton biomass(chlorophyll-a(Chl-a)), while water temperature exhibited threshold-dependent effects. Total organic carbon played dual roles, promoting PP concentrations in low-Chl-a regions, but suppressing it under high-Chl-a regions. Dual-scale buffer analysis(500 and 1000 m buffer zones) revealed PP heterogeneity stemed from interactive land use configurations, rather than isolated types. Balanced construction land-to-farmland ratio(0.467–2.890) elevated PP concentrations in human-dominated basins(the main stem of the Weihe River and Jinghe River), whereas excessive agricultural homogenization reduced PP likely due to fertilizer saturation and algal self-shading. Ecologically sensitive basins(the Beiluohe River Basin) demonstrated distinct patterns, in which PP concentration was regulated through natural-agricultural synergies. These results deepened the understanding of land use effects on aquatic PP,providing a theoretical basis for optimizing land use strategies to reconcile eutrophication control with ecological productivity in human-stressed basins.

关 键 词：CHLOROPHYLL-A water physical-chemical parameters land use proportions spatial heterogeneity Mantel test Spearman analysis inverse distance weighting 

分 类 号：F301.2[经济管理—产业经济] X143[环境科学与工程—环境科学]